Loom stop motion



y 1935- c. D. BROWN 2,009,872

LOOM STOP MOTI ON Filed April 25, 1934 2 Sheets-Sheet 2 W/ T/VESS.

INVENTOR.

ATTORNEY.

CL/NTON 5. Cosme/v.

Patented July 30, 1935 t UNITED STATES LOOM sror MOTION Carl D. Brown, Hopedale, Mass., assignor to Draper Corporation, Hopedale, Mass, at corporation of Maine Application April 25, 1934, Serial No. 722,332 9 Claims. (01. 1's9 s i9) The present invention pertains to looms and has more particular reference to mechanism under control of the warp stop motion for effecting I loom stoppage.

In accordance with accepted practice, the loom driving means is controlled by a manually operable shipper handle which, in turn,may be moved from loom running to loom stopping position by any of a plurality of automatic stop motions. Preferably, braking devices are provided, of such efliciency that the loom comes to a complete stop within less than half a revolution of the crank shaft from the moment when the shipper handle commences its movement toward stopping position. Such effective stopping of the loom is, in many instances, requisite to the eflicient handling of the loom when it stops from a center fork stop motion for example.

However, prior to the present invention, the knock-oil mechanism controlled from the warp stop motion was not designed to take advantage of the efficient brakes, and it stopped the loom in such a position that extra manipulations of the loom were required before restarting. That is, when a warp thread is broken, the loom must be positioned with the harnesses level, the lay being then at or nearly at front center, before the broken thread can be repaired. Prior warp stop motion knock-off devices were so constructed as to knock off the shipper handle (usually from the lay) as the loom approached the end of its forward or rearward movement, wherefore the loom would stop with the lay between the ends of its movement and the harnesses separated. 35 .Then, after the loom had stopped as just stated, it was necessary for the weaverto position the loom by hand before the broken threadcould be repaired, thus adding materially to the weavers duties.

I propose to provide knock-off mechanism, particularly for use with a warp stop motion, which will initiate loom stoppage at such time as to cause the loom to come to a complete stop with the'lay at about front center and the harnesses level, thereby eliminating the aforementioned extra manipulation of the loom by the Weaver.

To the end mentioned, the invention is comprised of a knock-off bunter carried by the lay pitman, and stoppage-initiating devices constructed and positioned to be actuated by such bunter as the lay commences its forward movement. More specifically, the hunter carried by the lay pitman has both vertical and horizontal components of movement, the stoppage-initiating means being actuable by virtue of only the vertical compostoppage at the desired time. a

The preferred embodiment of my invention is illustrated on the accompanying drawings, of w ch: 1 i

Fig. l is-aside elevation, partly in section, of the loom to which my invention has been applied;

Fig. 2 is'a view, to a larger scale, of certain parts as seen from the inside of thelooin; and Fig. 3 is a horizontal sectional view taken approximately en line 3-3 of Fig-, c I

I The loom to which the invention has been applied isbut fragmentarily illustrated, the per.- tions notshown being old and well known in the art and, formingno part of the present inver tion. vOf the usual loom frama there isillusnent of such movement, thereby initiating loom trated on the drawings only the left hand not.

The. main or crank shaft 2 is adapted to-be v n b s i b e. me s no sh wn and th starting and stopping of the loom is effected from the shipper handle 3. p The shipper handle is pivoted to the loom frame as at 4 and is in on position in Fig. 1. Reference may be had to the patent to Lindsjo et al. 1,850,306, granted March 22, 1932, for more detailed disclosure of the par.- ticular shipper mechanism shown. It. willbe here noted, however, that the loom stops within appreciably less than one half revolution of the crank shaft from the time the shipper handle starts to move rearwardly (toward the left, 1) to off position. r

The lay 5 is carried by pivotally supported lay swords, as 6, and reciprocates toward and from the front of the loomyas usual. The lay is reciprocated by lay pitmen, usually. two in number, of which there is shown only the lefthand pitman 1. The pitman I has a bearing engaging pin 8 in the lay sword, and is also provided with a bearing head engaging a crank 9 formed in the horizontally extending crank shaft .2 It will be seenthat the pitman operates entirely within a vertical plane. I

A mechanical warp stop motion H] of conventional; ,design is mounted on the loom frame at the rear thereof. The warpsheet W feeds for,- wardly throughthe warp stop motion to the harnesses l l, l lwhich form the shed- S, the warpscontinuing on through the reed [2 to the woven cloth C." The harnesses are level, in the process of crossing, just before the lay reaches front center and it is at such time that the loom should come to rest when stopped from the warp stop motion. i v J T It follows from what has been said abovetliat' if the loom is to stop at the desired time the shipper handle should be started rearwardly at about the time the lay commences to move forwardly, which result prior warp-stop motion knock-off devices were incapable of effecting. The present invention, however, provides knockoff means and stoppage-initiating means capable of effecting loom stoppage at the desired time.

The knock-off means of the present invention is comprised of knock-off bunter l3 carried by the lay pitman 1 and moving therewith. The bunter may be formed integrally with a collar I4 which is set-screwed to the pitman intermediate the ends of the latter, as shown. The bunter projects laterally and downwardlyfrom the collar, and the tip of the bunter has both vertical and horizontal components of movement, in the closed path represented by dot-and-dash line a, Fig. 2. Obviously, the bunter is moving downwardly and forwardly at the time the lay is commencing its forward movement.

Loom-stoppage-initiating means to be operated by the knock-off bunter may be variously contrived, the preferred-form being constituted by a member I5 in the form of a dog which is normally out of the path of the knock-off bunter but movable into such path under control of the warp stop motion. The dog is pivoted adjacent its lower end on a pin l6 carried by the arm I! of a bell-crank lever. The dog is provided with a fin l8 which rests against a'plunger [9 of the Bowdin wire 20 The wire 20 constitutes means controlled in a well known manner from the warp stop motion for moving the dog I5 into position to be engaged and actuated by the knock-off bunter. I

The arm I! of the lever on which dog I5 is pivoted is below the path a of the knock off hunter and terminates intermediate the ends thereof. The lever is fulcrumed on a pin 2| carried by a bracket 22 which'is fixed to theloom frame. A spring 23' extending between the dog and the pin 2Iserves to yieldingly maintain the dog out of the' path of the bunter. However, when the dog-is moved on the arm I! so as to intercept the bunter the dog will be actuated by virtue of the vertical component of movement of the bunter and will pivot on pm Hi to accommodate the forward movement thereof. A toggle spring 24 yieldingly holds the bell crank lever in-its normal position. 7

Connections for effecting loom stoppage from the'bell crank lever may be variously contrived, but preferably include an adjustable abutment 25 adapted to be engaged by the second arm 26 of the bell crank lever. In the particular embodiment shown the abutment is formed integrally with a head 21 which is threaded onto a rod28, the head being adjustable along the rod. The head is provided with an extension 29 which extends along the outside of the loom side to be received in and guided by guide fingers 30 formed on a bracket 3| which is fixed to the loom side. The forward end of the rod 28 is pivoted to a double acting element 32 for moving the shipper handle to off position when the rod 28 is moved rearwardly. This element is more fully described in the above mentioned Patent 1,850,306.

It will be apparent that the knock-off means above described is particularly adapted for use with a warp stop motion but is not necessarily limited to such use. It will likewise be apparent that I have succeeded in providing-knock-oif mechanism which is capable of effecting loom stoppage at the time when" the harnesses are level, thus dispensing with any necessity for further manipulation of the loom before repairing the broken threads and re-starting the loom.

Having fully described the preferred embodiment of my invention, I claim:

1. In a loom, the'combination of the forwardly and rearwardly reciprocating lay, a lay pitman, a knock-off bunter carried by said pitman and moving therewith in a closed path, a warp stop motion, a member adapted to be actuated by said bunter for initiating loom stoppage, said member being movable to a position where it intercepts and is actuated by said bunter as the lay commences its forward movement, and means controlled by said warp stop motion for moving said member as aforesaid.

2. .In a loom, the combination of the lay, a lay pitman, a knock-off bunter carried by said pitman and moving therewith in a closed path in a vertical plane, a Warp stop motion, a member normally positioned out of said path, said member being movable to a position where it intercepts and is actuated by said bunter as the latter moves downwardly and forwardly in said path, means controlled by said warp stop motion for so moving said bunter, and means actuated by said member for effecting loom stoppage.

3. In a loom, the combination of the forwardly and rearwardly reciprocating lay, a. lay pitman, a knock-off bunter carried by said pitman intermediate the ends of the latter and moving therewith in a vertical plane, a warp stop motion, a member controlled by said warp stop motion and movable thereby into said path in position to be engaged and actuated by said bunter as the lay commences its forward movement, and means operative upon actuation of said member to effect loom stoppage.

4. Loom knock-off means comprising in combination, a lay pitman operating in a vertical plane, a knock-01f bunter carried by said pitman and moving therewith in a closed path, a loom stop motion, a loom-stoppage-initiating member controlledby said stop motion and movable thereby into position to be engaged by said bunter and actuated by virtue of only the vertical component of movement of the same, and means operative upon said actuation of said member to effect loom stoppage.

5. In a loom, the combination of the forwardly and rearwardly reciprocating lay, a lay pitman operating in a vertical plane, a knock-01f bunter carried by said pitman and moving therewith in a closed path, a warp stop motion, a loom-stoppage-initiating member adapted to be engaged and actuated by said bunter during the first part of the forward movement of the latter, and means controlled by said warp stop motion for moving said member into said path for engagement and actuation by the hunter as aforesaid.

6. In a loom, the combination of the forwardly and rearwardly reciprocating lay, a lay pitman operating in a vertical plane, a knock-off bunter carried by said pitman intermediate the ends of the latter and moving therewith in a closed path,

a warp stop motion, a bell crank lever having an arm the free end of which is positioned below said path and intermediate the ends thereof, a dog movable on said arm to position where it is engaged and actuated by said bunter, means controlled by said warp stop motion for moving said dog, and connections actuated from the other arm of said lever for effecting loom stoppage.

'7. In a loom, the combination of the forwardly and rearwardly reciprocating lay, a lay pitman operating in a vertical plane, a knock-off bunter carried by said pitman and moving therewith in a closed path, a warp stop motion, a bell crank lever, a dog pivoted to the free end of one arm of said lever, means controlled by said warp stop motion for swinging said dog into position to be engaged and actuated by said bunter, and connections actuated from the other arm of said lever for effecting loom stoppage.

8. In a loom, the combination of the forwardly and rearwardly reciprocating lay, a lay pitman operating in a vertical plane, a knock-off bunter carried by said pitman intermediate the ends of the latter and moving therewith in a closed path, a warp stop motion, a bell crank lever having an arm the free end of which is positioned below said path and intermediate the ends thereof, a dog pivoted on the free end of said arm, said dog being movable to a position where it is engaged and actuated by said bunter as the lay commences its forward movement, means controlled by said warp stop motion for so moving said dog, and

means including an adjustable abutment engageable by the other arm of said lever for effecting loom stoppage.

9. In a loom, the combination of the forwardly and rearwardly reciprocating lay, a lay pitman, a knock-oil bunter carried by said pitman and moving therewith in a closed path, a warp stop motion, a bell crank lever pivoted on a fixed fulcrum, a dog pivoted to one arm of said lever, said dog being normally biased out of said path but movable into the same, means controlled by said warp stop motion for moving the dog into the said path whereby the bunter, through the dog, tilts said lever on its fulcrum, and connections actuated from the other arm of said lever for effecting loom stoppage.

CARL D. BROWN. 

